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<p>The tensile and fracture characteristics of polypropylene (PP)/ethylene propylene diene monomer (EPDM) and PP/EPDM/clay composites were studied. Two weight ratios of PP/EPDM (80/20 and 90/10), and three levels of clay (0, 3, and 6 wt%) were used. The compounds were manufactured using both unvulcanized and dynamically vulcanized processes. The results revealed adding 10 wt% of EPDM to the PP matrix enhanced elongation at break by 326%, but decreased tensile strength and elastic modulus by 28 and 18%, respectively, compared to pure PP. Moreover, adding 3 wt% of clay to PP with 10 wt% of EPDM caused 38% reduction in the elongation at break, while increasing the tensile strength and elastic modulus. The findings of the EWF tests revealed that adding EPDM up to 10 wt%, increased EWF (<i>w</i><sub><i>e</i></sub>), and non-essential work of fracture (non-EWF) (<i>βw</i><sub><i>p</i></sub>) by 145 and 177%, respectively, compared to pure PP. In addition, adding 3 wt% of clay to PE10U caused 8 and 6% increase in w<sub>e</sub> and <i>βw</i><sub><i>p</i></sub>, respectively, compared to PE10U. The mechanical and fracture properties of the dynamically vulcanized compounds were higher than those of unvulcanized ones.</p>

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Experimental Analysis of Fracture Properties of Unvulcanized and Dynamically Vulcanized PP/EPDM/Clay Via Essential Work of Fracture

  • 期刊论文

  • 发表日期：

    2025年11月12日

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  • Mahdi Mahabadifar,
  • Faramarz Ashenai Ghasemi,
  • Mohammad Fasihi,
  • Pouya Rajaee

摘要

The tensile and fracture characteristics of polypropylene (PP)/ethylene propylene diene monomer (EPDM) and PP/EPDM/clay composites were studied. Two weight ratios of PP/EPDM (80/20 and 90/10), and three levels of clay (0, 3, and 6 wt%) were used. The compounds were manufactured using both unvulcanized and dynamically vulcanized processes. The results revealed adding 10 wt% of EPDM to the PP matrix enhanced elongation at break by 326%, but decreased tensile strength and elastic modulus by 28 and 18%, respectively, compared to pure PP. Moreover, adding 3 wt% of clay to PP with 10 wt% of EPDM caused 38% reduction in the elongation at break, while increasing the tensile strength and elastic modulus. The findings of the EWF tests revealed that adding EPDM up to 10 wt%, increased EWF (we), and non-essential work of fracture (non-EWF) (βwp) by 145 and 177%, respectively, compared to pure PP. In addition, adding 3 wt% of clay to PE10U caused 8 and 6% increase in we and βwp, respectively, compared to PE10U. The mechanical and fracture properties of the dynamically vulcanized compounds were higher than those of unvulcanized ones.